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<title>js平滑滚动到顶部、底部、指定地方</title> 
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<div class="box a">产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍产品介绍</div> 
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<p class="scroll_top">返回顶部</p> 
<p class="scroll_a">产品介绍</p> 
<p class="scroll_bottom">滑到底部</p> 
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